Door lock



FIG. 1 is a front elevational view of a door lock showing our new design;

FIG. 2 is a front left perspective view thereof;

FIG. 3 is a front right perspective view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is bottom plan view thereof; and,

FIG. 7 is top plan view thereof.

The elements shown in broken lines illustrating a lock handle and a key hole are included for the purpose of illustrating environment and form no part of the claimed design. 

CLAIM I claim the ornamental design for a door lock, as shown and described. 